Tek'it Audio has released MScontrol, a free mid-side controller utility plugin.
MScontrol offers stereo signal encoding into mid­-side signal, decoding of mid­-side signal into stereo signal, as well as an "onboard" mode to adjust the signal.
A user can use the plug-in to take control of their gain, panoramic, flip the phase, or mute the mid or side signals separately. A user can widen their sound, move it the way they want in the stereo space or enhance the mono compatibility.